Sling TV is a new $20-per-month live TV package with 16 channels, including ESPN, AMC, TNT, CNN, History, HDTV and the Disney Channel. How does it work, how can you get it -- and will it let you quit cable?

PlayStation Vue is the new TV service from Sony that starts at $50 per month. Its competitor Sling TV starts at $20 per month. Both use the Internet to stream numerous live TV channels as well as VOD, and both are free from long-term contracts. So how do they stack up?